There's a lot of promising RTSs currently in development, that can trace their roots to Blizzard and/or SC2.
As wheelerof4te suggests, I'd keep my eyes on Stormgate. It's being developed by the ex-Blizzard team that worked on SC2 and WC3. More big names involved than I care to drop. https://playstormgate.com/>, https://store.steampowered.com/app/2012510/Stormgate/>
ZeroSpace came out of the blue a couple months ago with pre-alpha gameplay videos, kickstarter, tournaments, etc. They have several SC2 pros and community figures involved in development (Scarlett, CatZ, PiG, GiantGrant, Maguro). Their kickstarter just raised over half a million dollars. https://www.playzerospace.com/>, https://store.steampowered.com/app/1605850/ZeroSpace/>.
There's also Immortal, which has been in development for a longer while. The team has previously built some great SC2 mods, and the pre-alpha got some attention from SC2 pros. https://sunspeargames.com/>
The big "problem" with RTS is that the genre in general is not very accessible. SC1 is clunky (1998), SC2 is extremely lethal (splash damage vs glass cannons), team modes like 2v2 are not considered seriously (people want to play with their friends), getting good at the game requires learning all the rock-paper-scissors of dozens of units per faction that make Pokemon type charts pale in comparison. The 1v1 ladder is designed to give you an average 50% winrate, hence it demands that you consistently play at your best or deal emotionally with a giant lose streak.
The team making Stormgate is aware of these (and many other) problems, and takes a lot of input from the community on Reddit. It's gonna boil down to execution, but I have faith that they can make a fun game that's gonna be appealing to a much broader crowd than the hardcore RTS fans.